Removed Unwanted Comments

Signed-off-by: Joydeep Tripathy <[email protected]>

Author: joydeep049

model/riscv_insts_base.sail

@@ -764,8 +764,6 @@ $[name "Fence (Instruction)"]
  */
 union clause ast = FENCEI : unit
 
-// The rs1, rd and imm fields are marked as reserved to indicate
-// that they are not currently used but may be reserved for future extensions.
 mapping clause encdec = FENCEI()
   <-> reserved_bits_12(ZERO) @ reserved_bits_5(ZERO) @ 0b001 @ reserved_bits_5(ZERO) @ 0b0001111